Preheat oven to 350 degrees. Lightly oil a 9x11 glass baking pan with a bit of coconut oil or spray.
Peel and slice apples and add to the pan.
Slice the rhubarb and add to the pan
Measure and add the mixed berries to the pan.
Sprinkle the coconut sugar over the fruit and lightly mix with a spatula.
cover the fruit with the oat mixture, pressing down gently to set it in place.
Bake for 45 minutes to 1 hour until fruit is soft and topping is crisp.
Serve with banana nice cream and enjoy!